Distributor

ABSTRACT

DEVICE TO DETERMINE THE CURRENT PATH IN AN IGNITION DISTRIBUTOR FOR MOTOR VEHICLE ENGINES HAVING A SWITCH OPERATED BY A THROTTLE VALVE LINKAGE AND A CIRCUIT BREAKER SYS- TEM CONTROLLED BY THE SWITCH AND PROVIDED WITH AN INTERMEDIATE LEVER TO CHANGE THE SWITCH.

Mag-ch 20,1973 H. HAND/w Em 3,721,223

DISTRIBUTOR Original Filed June 25. 1969 INVENTORS HeZ-mui P91724110"Bode E. Efiorw 3,721,223 DISTRIBUTOR Heimut Klaus Randau, Wolfsburg,and Bodo Egon Taphorn, Vorsfelde, Germany, assignors to VolkswagenwerkAktiengesellschaft, Wolfsburg, Germany Continuation of abandonedapplication Ser. No. 836,229, June 25, 1969. This application May 18,1971, Ser. No. 144,626 Claims priority, application Germany, June 28,1968, P 17 51 612.0 Int. Cl. F0211 11/10 US. Cl. 123-402 6 ClaimsABSTRACT OF THE DISCLOSURE Device to determine the current path in anignition distributor for motor vehicle engines having a switch operatedby a throttle valve linkage and a circuit breaker system controlled bythe switch and provided with an intermediate lever to change the switch.

This is a streamlined continuation application filed copending with U.S.patent application Ser. No. 836,229, now abandoned. Also, thedistributor referred to herein is described in commonly owned US. patentapplication Ser. No. 730,053, filed May 17, 1968, and now US. Pat. No.3,577,963.

This invention relates to a distributor for the engines of motorvehicles having a switch operated by the throttle valve linkage; withthe throttle valve closed, a circuit breaker system is influenced by acentrifugal governor (conventional centrifugal advance mechanism) andanother circuit breaker system is influenced in each open position ofthe throttle valve, influenced by a vacuum governor. The basic settingfor the time of ignition of the centrifugal governor has been at thesame time selected relatively late as compared to that of the vacuumgovernor, in order to achieve the purpose of purification of exhaust gasduring idling and to achieve a good combustion and to achieve goodriding characteristics during acceleration and travel. If the switchwere operated directly by the lever of the throttle valve, then, if theposition of the throttle valve or of the throttle valve lever isregulated by the idle limiting screw as an adjustment screw, thedistance of the throttle valve lever in relation to the switch wouldalso need to be newly set each time, so that it would be necessary tomake additionally either the switch itself shiftable or to provide ashiftable stop at the throttle valve lever.

It is an object of the invention to develop the operating linkage insuch a manner that only a single adjustment will be necessary. At thesame time one must make certain that upon opening the throttle from theidling position, the switch in any case will have been switched over tothe vacuum governor before the throttle valve begins to open. Even inthe case of a cold start, which at present almost generally takes placewhile closing a special starter valve, mostly operated automatically, aswell as by simultaneous slight opening of the throttle valve, an earlyignition is of advantage. A further object of the invention comprisesthe further demand that the linkage, whenever the starter valve closes,brings about each time an immediate switching over to the vacuumgovernor for an early ignition.

A further object of the invention resides in the fact that anintermediate lever with an additional path arranged between the switchand the throttle valve lever is provided for the purpose of switchingover the switch and of operating the throttle valve lever, with whichintermediate lever on the one hand the gas linkage and on the other handthe throttle valve return spring, will engage. Thus, said United StatesPatent "ice intermediate lever has an arm to switch over the switch anda second arm is provided for the operation of the throttle valve lever.The additional adjusting screw seated in the throttle valve lever hasbeen provided with a concentric stop plate for the second arm of theintermediate lever.

Furthermore, in the case of the arrangement of an automatic startervalve (automatically operated choke) with a speed pulley or fast idlecam, known per se, the intermediate lever is provided with a third armreaching behind the throttle valve lever.

In a further development of the invention, the switch has been firmlyattached to the carburetor and the intermediate lever'has been arrangedswivelably on the shaft of the throttle valve. A compensating spring,which is weaker than the return spring, connects the intermediate leverand the throttle valve lever.

Further objects of the invention will be apparent from the followingdescription when considered in connection with the accompanying drawingin which:

FIG. 1 is a diagrammatic view showing a carburetor with the arrangementaccording to the invention in the position for idling and thrust with awarm engine,

FIG. 2 is a similar view showing the carburetor in the position of theparts in the case of a cold start, and

FIG. 3 is a similar view showing the carburetor in the position of fullgas consumption.

On the carburetor 1 with the throttle valve 2 and the throttle valvelever 3, the member 4 designates the customary automatic starter valve(described in more detail for example in the journal, Gute Fahrt: 1965,Issue 1, pages 24 to 27; Issue 4, pages 64 to 67 and Issue 5, pages 18and 19) and numeral 5 designates the speed pulley or segment of thestarter valve 4. An additional adjusting screw 6 seated at the end ofthe throttle valve lever 3 contacts the speed pulley 5 each time againstone of the notches which depends on the temperature of the motor, forexample FIG. 2 against the uppermost notch in the case of a cold motor(cold start with closed starter valve 4) or FIG. 1 in the case of a warmengine at the lowest notch of the speed pulley (warm idling and thrustclosed throttle operation, starter valve 4 fully opened).

A distributor 7, has two circuit breaker systems independent of oneanother and arranged one above the other, namely (not shown in detail)in superposed relation, the one influenced by the centrifugal governoradjusted in its basic position for delayed ignition, the circuit breakercable 8 leading to its circuit breaker, and the lower one influenced bya vacuum governor, adjusted to early ignition with the circuit breakercable 9. The primary cable 11 coming from the ignition coil 10 leads toa switch 12 which is press-button operated and firmly disposed on thecarburetor 1, said switch 12 guides the primary current in the case of aclosed throttle valve 2 to the circuit breaker cable 8 of thecentrifugal governor system, and in the case of an opened throttle valve2, on the other hand, to the circuit breaker cable .9 of the vacuumgovernor system.

On the shaft of the throttle valve 2 and throttle valve lever 3, anintermediate lever 13 is seated swivelably, which has an arm 14 foroperation of the switch 12, a second arm 15 for operation of thethrottle valve lever 3 provided with a concentric stop plate 16 on theidling adjusting screw 6, as well as a third arm 17 which reacheshook-like behind the throttle valve lever 3. There is always a play s. s(idling play) between arm 15 and stop plate 16 or correspondinglybetween arm 14 and the pressure button of switch 12, the size of saidplay depending on which notch of the speed pulley the idling adjustingscrew 6 stands in the throttle valve lever 3. Furthermore, between thehook of arm 17 and the throttle valve lever 3, there is furthermore adistance a. .a which, however, will disappear in the cold startingposition whenever the idling adjusting screw 6 stands on one of theupper notches, so that the intermediate lever 13 is driven and arm 14 islifted 01f switch 112, said distance depending on the notch which comesto bear (the load) in each instance, but besides that also on theposition of the idling adjusting screw 6 in the throttle valve lever 3.The customary return spring 18, closing the throttle valve 2, engageswith the intermediate lever 13 and the gas linkage 19 engages in anopposite direction. In order to avoid rattling noises subject to idlingpath a, a compensating spring 20- has been provided which is weaker thanthe return spring 18 and connects the throttle valve lever 3 and theintermediate lever 13.

In the case of a warm motor or of an open starter valve 4 (FIG. 1), theidling adjusting screw 6 abuts on one of the lower notches of speedpulley 5, the return spring 18 pulling arm 14 on the intermediate lever13 against switch 12, since the hook-shaped arm 17 of the intermediatelever 13 does not fit against the throttle valve lever 2 (distance a),as a result of which the circuit breaker system with the basicadjustment delay is switched on, which system is operated by means of acable 8 on the distributor 7 by the centrifugal governor.

In the case of a cold start (FIG. 2), the idling adjusting screw 6 ispositioned at S while increasing the idling path on the uppermost notchof the speed pulley 5, the throttling lever 3 has driven intermediatelever 13 with its hook-shaped arm 17 to such a point that switch 12 willhave reversed by means of the cable 9 to the circuit breaker systemadjusted for early firing.

Likewise by means of the cable 9 early ignition (firing) has beenswitched on in the case of all open positions of the throttle valve 2(acceleration and even speed) up to full gas position (FIG. 3), but arm15 will then fit against stop plate 16 and will have operated throttlevalve lever 3, whereas now the distance between the hookshaped arm 17and throttle valve lever 3 has increased to a By the use of theintermediate lever 13 according to the invention and by the changeableidling path s, an adjustment will be required only at a single position,namely at the idling adjusting screw for low speed adjustment of theidling and the reversing point of switch 12, and it will be assuredsimultaneously that upon opening the throttle from the idling position,in order to avoid under certain circumstances a jerky jump in the R.P.M.of the motor, the switch will always first reverse to the vacuumgovernor and the throttle valve will be opened only subsequently.

What is claimed is:

1. A device to determine the current path in an ignition distributor forthe engine of a motor vehicle which has a vacuum governor and acentrifugal governor and a carburetor having a throttle valve,comprising; a switch mounted on said carburetor, throttle valve linkagemounted on said carburetor, said linkage including a pivotally mountedintermediate lever having a limited idling path with respect to a leverprovided on said throttle valve, said intermediate lever having a firstarm for operating said switch, a first circuit breaker system for thecentrifugal governor controlled by said switch so that when saidthrottle valve is in a closed position said carburetor is infiuenced bysaid centrifugal governor, a second circuit breaker system for thevacuum governor controlled by said switch so that when said throttlevalve is in an opend position said carburetor is influenced by saidvacuum governor, said intermediate lever being disposed between saidswitch and said throttle valve lever, said intermediate lever beingconnected at one end to a gas linkage means opposed by a return springand intermediate its ends being hooked to said throttle valve lever formovement thereby in one direction during the opened position of saidthrottle valve.

2. Deviceaccording to claim 1 wherein said intermediate lever isprovided at its opposite end with a second arm for operating saidthrottle valve lever.

3. Device according to claim 2 wherein an idling adjustment screw meansis mounted on said throttle valve lever, said screw means including astop plate against which said second arm of said intermediate leverrests for operation of said throttle valve lever.

4. Device according to claim 3 wherein said carburetor includes anautomatic starter valve, a speed pulley member connected to said startervalve, said intermediate lever being provided with a third arm forhooking on to said throttle valve lever, said speed pulley member havinga plurality of notches at its free end facing said adjustment screwmeans with the uppermost one of said notches being in contact with saidscrew means during a cold start of said motor, said intermediate leverbeing moved as a result thereof away from said switch by means of saidthird arm.

5. Device according to claim 4 wherein said intermediate lever ispivotally disposed on a shaft of said throttle valve.

6. Device according to claim 5 wherein a compensating spring is providedwhich is weaker than said return spring, said compensating springconnecting said intermediate lever and said throttle valve lever.

References Cited UNITED STATES PATENTS 1,663,207 3/1928 Mallory 123-1171,759,425 5/1930 Suekoft 123-448 2,652,038 9/1953 Winkler 123-117 A2,775,711 12/1956 Kommer 123179 A 3,327,553 6/1967 Peras 123-117 A3,455,260 7/1969 Mennesson 123-l02 X LAURENCE M. GOODRIDGE, PrimaryExaminer US. Cl. X.R.

